Two painters

Two painters are assigned to finish painting the houses in a housing project. John can finish a house in 4 days. Kurt painted it in 3 days. How long would it have taken if John and Kurt worked painting the house together?

Correct answer:

x =  1.7143 d

Step-by-step explanation:

J=4 d K=3 d  a=1/J+1/K=1/4+1/3=1270.5833  x=1/a=1/0.5833=1.7143 d

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